Heat both the oils in a saucepan over medium heat.
When the oils become hot, add the chopped onion.
Add the white part of the spring onion too.
Stir fry till it becomes a bit soft.
Add the garlic, stir fry for a minute.
Add the chopped coriander stalks, ginger and green chilli paste or slices. Stir fry for 30 seconds.
Add the rest of the chopped vegetables.
Stir fry on high for 2 minutes.
Add the soy sauce mixture and 4 cups of the water in which the noodles were boiled.
Bring the soup to a boil.
While stirring the soup, add the cornstarch slurry.
Mix well. Lower the heat and simmer for another 1-2 minutes.
Don't boil too much as the vegetables should remain crunchy and not over cooked.
Ladle soup into 4 serving bowls.
Top it with the deep fried noodles.
Garnish with coriander leaves and the green part of the spring onion.
Serve immediately.